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 Multiple Choice QuestionsMultiple Choice Questions


Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am2 and 1.00 Am2 respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South.
They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid - point O of the line joining their centres is close to(Horizontal component of earth’s magnetic induction is 3.6 × 10–5 Wb/m2)

  • 3.6 x10-5 Wb/m2

  • 2.56 x10-4 Wb/m2

  • 3.50  x10-4 Wb/m2

  • 3.50  x10-4 Wb/m2



Relative permittivity and permeability of a material are εr and µr, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

  • εr = 0.5, µr = 1.5

  • εr = 1.5, µr = 0.5

  • εr = 0.5, µr = 0.5

  • εr = 0.5, µr = 0.5



Needles N1, N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

  • attract all three of them

  • attract N1 and N2 strongly but repel N3

  • attract N1 strongly, N2 weakly and repel N3 weakly

  • attract N1 strongly, N2 weakly and repel N3 weakly



Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to 3d. The new value of the force between them is

  • −2F 

  • F/3

  • −2F/3

  • −2F/3



The length of a magnet is large compared to its width and breadth. The time period of its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be

  • 2 s

  • 2/3 s

  • 2√3 s

  • 2√3 s



The materials suitable for making electromagnets should have

  • high retentivity and high coercivity

  • low retentivity and low coercivity

  • high retentivity and low coercivity

  • high retentivity and low coercivity



A bar magnet of moment of inertia 9 x 10-5 kg m2 placed in a vibration magnetometer and oscillating in a uniform magnetic field 16π2 × 10-5 T makes 20 oscillations in 15 s. The magnetic moment of the bar magnet is

  • 3 A-m2

  • 2 A-m2

  • 4 A-m2

  • 6 A-m2



Identify the correctly matched pair

  • Diamagnetic   —   Gadolinium

  • Soft ferromagnetic   —   Alnico

  • Hard ferromagnetic   —   Copper

  • Paramagnetic   —   Sodium


Paramagnetic   —   Sodium

Some substances when placed in a magnetic field, are feebly magnetised in the direction of the magnetising field. These substances, when brought close to a pole of a powerful magnet, are attracted towards the magnet. These are called 'paramagnetic' substances and their magnetism is called 'paramagnetism'.

For examples of paramagnetic substances are aluminium, sodium, platinum, copper, manganese, antimony, chloride, liquid oxygen. Solution of salts of iron and nickel, etc

So, correctly matched pair are paramagnetic — Sodium.


The ferromagnetic core of electromagnets should have

  • a broad hysteresis loop

  • high permeability and high retentivity

  • high permeability and low retentivity

  • low permeability and high retentivity


A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rads-1. If the horizontal component of earth's magnetic field is 0.2 x 10-4 T, then the emf developed between the ends of the conductor is

  • 5 µV

  • 5 mV

  • 50 µV

  • 50 mV